JPS6342564B2 - - Google Patents
Info
- Publication number
- JPS6342564B2 JPS6342564B2 JP12818679A JP12818679A JPS6342564B2 JP S6342564 B2 JPS6342564 B2 JP S6342564B2 JP 12818679 A JP12818679 A JP 12818679A JP 12818679 A JP12818679 A JP 12818679A JP S6342564 B2 JPS6342564 B2 JP S6342564B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- layer
- gas barrier
- gate
- injected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920005989 resin Polymers 0.000 claims description 73
- 239000011347 resin Substances 0.000 claims description 73
- 230000004888 barrier function Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000010410 layer Substances 0.000 description 39
- 239000007789 gas Substances 0.000 description 24
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000011162 core material Substances 0.000 description 5
- 229920005672 polyolefin resin Polymers 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Description
【発明の詳細な説明】
本発明はガス遮断性のある多層容器に関するも
のである。従来、ガス遮断性のある多層容器とし
てはガス遮断性樹脂層を含む多層パリソンを利用
した多層ブロー容器や多層化したフイルムをシー
ルして作成したラミネートタイプの袋やチユーブ
容器などがあり、射出成形品としての多層容器は
あまり使用されていない。射出成形品は寸法精度
が良く従つてキヤツプや蓋等との嵌合が良く、シ
ヤープな形状を再現することができ、肉厚形状な
ど多彩なものが成形できるという長所を有してい
るが、単層の成形品が殆どで、透湿性を防いだ
り、酸素などのガス遮断性を有する多層の射出成
形品はあまり使用されていない。一般にガス遮断
性の樹脂は高価であるばかりでなく、湿度の影響
を受けやすいので、湿気の透過を防ぐポリオレフ
イン系の樹脂によつてガス遮断性樹脂をサンドイ
ツチする方法が良い事が一般に知られている。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multilayer container with gas barrier properties. Traditionally, multilayer containers with gas barrier properties include multilayer blow containers using a multilayer parison containing a gas barrier resin layer, laminate type bags and tube containers made by sealing multilayer films, and injection molding. Multilayer containers are not widely used as products. Injection molded products have the advantage of having good dimensional accuracy, fitting well with caps, lids, etc., being able to reproduce sharp shapes, and being able to mold a wide variety of things, including thick shapes. Most of the products are single-layer molded products, and multi-layer injection molded products that prevent moisture permeability or have gas barrier properties such as oxygen are not often used. In general, gas barrier resins are not only expensive but also susceptible to humidity, so it is generally known that it is better to sandwich the gas barrier resin with a polyolefin resin that prevents moisture from permeating. There is.
又、多層の成形品を製造するには従来雄型一つ
により大きなキヤビテイの雌型を順次使用して一
層ごとに、型締、保圧、冷却、型開、型の移動を
繰り返す事により順次多層化する多層射出成形法
が知られているが、この方法に於いては成形品は
肉厚となり、又成型サイクルも長く価格が非常に
高くなつてしまうと共にガス遮断性樹脂とオレフ
イン系樹脂というような異質の樹脂同士を接着さ
せて成形しようとする場合、ゲートから離れたキ
ヤビテイ周縁部での接着力が低い等の問題も生じ
ていた。 In addition, in order to manufacture multi-layer molded products, conventionally, female molds with larger cavities are used in sequence than the male mold, and mold clamping, holding pressure, cooling, mold opening, and mold movement are repeated for each layer. A multilayer injection molding method is known, but in this method, the molded product is thick, the molding cycle is long, and the price is very high. When attempting to mold such dissimilar resins by adhering them to each other, problems such as low adhesive strength at the peripheral edge of the cavity remote from the gate have also arisen.
又、このような方法に対して一つの固定された
キヤビテイに２種以上の樹脂を射出して積層する
方法も周知である。この方法はまず始めに金型キ
ヤビテイ全体に満たない量の第一樹脂（スキン）
樹脂を射出し、その第一樹脂の中心部が固化せず
に流動状態にある内に、第二樹脂（内核材）を射
出する事により、第一樹脂中に第二の樹脂が射出
され多層化するものである。この方法に於いて
は、かなり薄肉の成形品を得ることが可能であ
り、成形時間も一般の単層成形と殆ど変わらずに
成形できるという長所がある一方、この方法で例
えば内外層１，２である第一樹脂としてポリオレ
フイン系樹脂を用い、内核材層３である第二樹脂
としてガス遮断性樹脂、例えば、ポリアミド系樹
脂やエチレン−酢酸ビニル共重合体ケン化物など
を使用すれば、多層で薄肉の射出成形品として第
１図に示すような成形品が得られる。しかしなが
らこの方法においては表面の第一樹脂層が薄くな
いと（言い換えれば第二樹脂層が厚くないと）、
ゲートから離れた所まで多層化できない。従つて
この方法では第二樹脂であるガス遮断性樹脂を
隅々まで行き渡るようにするには、少なくとも第
二樹脂を全金型キヤビテイ容量の50％以上、好ま
しくは、60〜80％の容量分のガス遮断性樹脂を射
出する必要があり、成型品としては高価になつて
しまうという問題を生じる。又、この方法ではゲ
ート反対側すなわち第１図においてＡの部分の第
一樹脂が肉薄になつてしまうという欠点を持つ為
にその部分での透湿防止効果は著しく低下する傾
向にあると共に、Ａの部分の第一樹脂と第二樹脂
との接着強度は著しく低下してしまい、例えば多
少ともフレキシブル性を必要とする薄肉成形品に
おいては、層間剥離が生じるという問題があつ
た。 Furthermore, in contrast to this method, a method of injecting and laminating two or more types of resin into one fixed cavity is also well known. In this method, the first resin (skin) is added in an amount that is less than the entire mold cavity.
By injecting the resin and injecting the second resin (inner core material) while the center of the first resin is in a fluid state without solidifying, the second resin is injected into the first resin, creating a multilayer structure. It is something that becomes. This method has the advantage that it is possible to obtain a fairly thin-walled molded product, and the molding time is almost the same as that of general single-layer molding. If a polyolefin resin is used as the first resin, and a gas barrier resin, such as a polyamide resin or saponified ethylene-vinyl acetate copolymer, is used as the second resin, which is the inner core material layer 3, a multilayer structure can be formed. A thin injection molded product as shown in FIG. 1 is obtained. However, in this method, if the first resin layer on the surface is not thin (in other words, if the second resin layer is not thick),
Multi-layering cannot be done far from the gate. Therefore, in this method, in order to spread the gas barrier resin, which is the second resin, to every corner, the second resin must be used in an amount of at least 50% or more, preferably 60 to 80%, of the total mold cavity capacity. It is necessary to inject gas-barrier resin of 300 ml, which poses the problem of making the molded product expensive. In addition, this method has the disadvantage that the first resin on the opposite side of the gate, that is, the part A in FIG. The adhesive strength between the first resin and the second resin in the portion markedly decreases, and for example, in thin-walled molded products that require some degree of flexibility, there is a problem that delamination occurs.
本発明は以上の欠点を解消した多層の射出成形
品の製造方法を提供するものであつて、防湿性を
有するポリオレフイン系樹脂を最外層とし、その
内部にガス遮断性に優れた薄肉層とを包含し且つ
ゲート周辺においては３層であり、その他ゲート
から離れた部分では５層以上の層構成からなる射
出多層容器である。 The present invention provides a method for manufacturing a multilayer injection molded product that eliminates the above-mentioned drawbacks, and includes a moisture-proof polyolefin resin as the outermost layer and a thin layer with excellent gas barrier properties inside. It is an injection multilayer container that includes three layers around the gate and has five or more layers in other parts away from the gate.
以下第２〜３図を用いて詳細に説明する。第２
図は本発明の多層容器を示す一部断裁斜視図であ
つて、成形時においてゲートより離れた部分ｑに
おいては５層構成となり、表面層である最内層４
および最外層５は吸水性の低いポリオレフイン系
の防湿性樹脂であり、この最内層４および最外層
５の内側には一層ずつガス透過を防止するガス遮
断性樹脂層６，７が設けられている。さらにこの
ガス遮断性樹脂層６，７の間には上記最内外層
４，５と同質あるいは相容性の良いポリオレフイ
ン系の熱可塑性樹脂である内核材層８が設けられ
ている。 A detailed explanation will be given below using FIGS. 2 and 3. Second
The figure is a partially cutaway perspective view showing the multilayer container of the present invention, and the part q away from the gate during molding has a five-layer structure, with the innermost layer 4 being the surface layer.
The outermost layer 5 is a moisture-proof polyolefin resin with low water absorption, and gas barrier resin layers 6 and 7 are provided inside the innermost layer 4 and the outermost layer 5 to prevent gas permeation. . Furthermore, an inner core material layer 8 is provided between the gas barrier resin layers 6 and 7, which is a polyolefin thermoplastic resin that is the same as or has good compatibility with the outermost layers 4 and 5.
一方、ゲート周辺Ｐでは３層（又は４層）であ
り、ガス遮断性樹脂層６のうちゲート反対側のガ
ス遮断樹脂層６がない。したがつて本発明の多層
容器は比較的高価であるガス遮断性樹脂を薄肉に
してあり安価な成形品を作成できるばかりでなく
最内外層に吸水率の低い樹脂を使用しているので
耐薬性に優れ、又ガス遮断性樹脂層が二重となつ
ているのでガス遮断性も優れ且つフレキシブルな
薄肉の成形品においても変形、衝撃等の外力に対
しても層間剥離を起すことのない多層容器を提供
するものである。 On the other hand, there are three layers (or four layers) around the gate P, and among the gas barrier resin layers 6, there is no gas barrier resin layer 6 on the opposite side of the gate. Therefore, the multi-layered container of the present invention not only makes it possible to create an inexpensive molded product by using a relatively expensive gas barrier resin with a thin wall, but also has chemical resistance because it uses a resin with low water absorption for the outermost layer. This is a multilayer container that has excellent gas barrier properties due to its double gas barrier resin layer, and does not cause delamination even in flexible thin-walled molded products due to external forces such as deformation and impact. It provides:
ここで上記ガス遮断性樹脂層６，７は材料コス
トを考慮して比較的薄肉に設けることが好まし
い。 Here, the gas barrier resin layers 6 and 7 are preferably provided relatively thinly in consideration of material cost.
次に上記多層容器の製造方法としては第３図に
示すような固定された雄型および雌型からなる一
つのキヤビテイ９に二つ以上（図面においては三
つ）の樹脂を射出する多層射出成形装置を使用
し、キヤビテイー内に順次射出を繰返す事によつ
て得るのであつて、以下さらに詳しく説明する。 Next, as a manufacturing method for the above-mentioned multilayer container, as shown in FIG. 3, multilayer injection molding involves injecting two or more (three in the drawing) resin into one cavity 9 consisting of a fixed male mold and a female mold. It is obtained by sequentially repeating injection into a cavity using a device, and will be explained in more detail below.
第３図に示すような装置により、まず防湿性を
有する最内外層４，５となるべき第１樹脂１０を
金型キヤビテイ９内に全キヤビテイ容量を満たさ
ない所望の量だけ射出し、次いでこの第１樹脂１
０の中心部が固化せず、流動状態にある内に、前
記ガス遮断性樹脂層６，７になるべき第２樹脂１
１を該第１樹脂１０量と合せても全キヤビテイ容
量を満たさない所望量を射出する。この射出工程
により第１樹脂１０中に第２樹脂１１が射出され
るのである。次にこの第２樹脂１１の中心部が固
化せず流動状態にあるうちに第２樹脂１１の流動
開始温度（又は融点）より充分に高い温度に加熱
した第３樹脂１２を射出するものである。この時
キヤビテイ周辺の肉厚はあまり肉厚でなく５mm以
下好ましくは３mm以下とし、又射出圧力や射出速
度が高い方が好ましい。 Using a device as shown in FIG. 3, the first resin 10 that is to become the outermost and moisture-proof layers 4 and 5 is first injected into the mold cavity 9 in a desired amount that does not fill the entire cavity capacity. First resin 1
0 is not solidified and is in a fluid state, the second resin 1 to become the gas barrier resin layers 6 and 7 is formed.
1 and the 10 amounts of the first resin, a desired amount that does not fill the total cavity capacity is injected. The second resin 11 is injected into the first resin 10 through this injection process. Next, the third resin 12 heated to a temperature sufficiently higher than the flow start temperature (or melting point) of the second resin 11 is injected while the center of the second resin 11 is not solidified and is in a fluid state. . At this time, the wall thickness around the cavity is not very thick, but is 5 mm or less, preferably 3 mm or less, and it is preferable that the injection pressure and injection speed are high.
上記方法によつて、ゲート周辺部Ｐでは第２樹
脂であるガス遮断性樹脂層は一層だけとし、ゲー
トから離れた部分では二重の層にすることが可能
となつた。従つてゲート反対側P′の層間の接着力
の低下による層間剥離は第１樹脂と第３樹脂を同
質の樹脂又は接着力の充分ある相容性の良い樹脂
同士を使用することにより防ぐことが可能とな
る。又本方法によればガス遮断性樹脂層である第
２樹脂の射出量は全キヤビテイ容量の20％以下に
する事が充分可能であり、非常に安価で丈夫であ
るばかりではなく、ガス遮断性、防湿性に優れた
成形品を得ることができる。 By the above method, it has become possible to make the gas barrier resin layer, which is the second resin, only one layer in the gate peripheral area P, and to make it double layers in the area away from the gate. Therefore, delamination due to a decrease in the adhesive strength between the layers on the opposite side of the gate P' can be prevented by using the same resin or resins with sufficient adhesive strength and compatibility for the first and third resins. It becomes possible. In addition, according to this method, it is possible to reduce the injection amount of the second resin, which is the gas barrier resin layer, to 20% or less of the total cavity capacity, and it is not only extremely cheap and durable, but also has good gas barrier properties. , molded products with excellent moisture resistance can be obtained.
ここで本発明に使用される第１樹脂および第３
樹脂としては、吸水率の小さなポリプロピレン、
あるいはポリエチレン等を無水マレイン酸にてグ
ラフト変性したポリオレフイン系樹脂又はアイオ
ノマー、エチレン−酢酸ビニル共重合体等が考え
られ、第１樹脂と第３樹脂は全く同じ樹脂でもか
まわないし、炭酸カルシウム等の入つたハイフイ
ラー樹脂を第１樹脂あるいは第３樹脂のどちらか
片方に使用してもかまわない。又内核材層として
の第３樹脂として発泡樹脂を使用してもかまわな
い。他方ガス遮断性樹脂となる第２樹脂として
は、ナイロン樹脂、ポリ塩化ビニリデン、エチレ
ン−酢酸ビニル共重合体ケン化物などが考えられ
る。 Here, the first resin and the third resin used in the present invention are
As resin, polypropylene with low water absorption rate,
Alternatively, polyolefin resins or ionomers obtained by graft-modifying polyethylene with maleic anhydride, ethylene-vinyl acetate copolymers, etc. may be used, and the first and third resins may be the same resin, or may contain calcium carbonate, etc. The high filler resin may be used as either the first resin or the third resin. Further, a foamed resin may be used as the third resin as the inner core material layer. On the other hand, as the second resin serving as the gas barrier resin, nylon resin, polyvinylidene chloride, saponified ethylene-vinyl acetate copolymer, etc. can be considered.
第１図は従来の多層容器を示す一部断裁斜視図
であり、第２図は本発明の方法で得られる多層容
器の一実施例を示す一部断裁斜視図であり、第３
図は本発明の多層容器を成形する装置を示す簡略
図である。
４……最内層、５……最外層、６……ガス遮断
性樹脂層、８……内核材層。
FIG. 1 is a partially cutaway perspective view showing a conventional multilayer container, FIG. 2 is a partially cutaway perspective view showing an embodiment of the multilayer container obtained by the method of the present invention, and FIG.
The figure is a simplified diagram showing an apparatus for forming a multilayer container according to the present invention. 4... Innermost layer, 5... Outermost layer, 6... Gas barrier resin layer, 8... Inner core material layer.
Claims (1)
重合体を主成分とした熱可塑性樹脂よりなる最内
外層と、その内部にあつて、ガス遮断性樹脂より
なる層を含んだ容器を製造する方法で、雄型およ
び雌型からなるキヤビテイに、まず熱可塑性樹脂
をキヤビテイ容量を満たさない量の第１樹脂を射
出し、次にこの第１樹脂が流動状態にある内に、
ガス遮断性樹脂からなる第２樹脂を、前記第１樹
脂と合せてもキヤビテイ容量を満さない量を射出
し、さらに前記２つの樹脂と合せてキヤビテイ容
量を満たす量の熱可塑性樹脂を第３樹脂として、
第２樹脂の流動開始温度より加熱した状態で射出
することによりゲート周辺においてはガス遮断性
樹脂層が一層で、ゲートから離れた所ではガス遮
断性樹脂層を二層以上含んだ状態とする射出多層
容器の製造方法。1 A method for producing a container comprising an outermost layer made of a thermoplastic resin mainly composed of polyolefin or a graft-modified copolymer thereof, and a layer made of a gas barrier resin inside the outermost layer. First, a thermoplastic resin is injected into a cavity consisting of a female mold in an amount that does not fill the cavity capacity, and then, while this first resin is in a fluid state,
A second resin made of a gas barrier resin is injected in an amount that does not fill the cavity capacity even when combined with the first resin, and a third thermoplastic resin is injected in an amount that, when combined with the two resins, satisfies the cavity capacity. As a resin,
By injecting the second resin at a temperature higher than the flow start temperature, there is one layer of gas-barrier resin around the gate, and two or more gas-barrier resin layers are formed in areas away from the gate. Method for manufacturing multilayer containers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12818679A JPS5657632A (en) | 1979-10-04 | 1979-10-04 | Multilayer vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12818679A JPS5657632A (en) | 1979-10-04 | 1979-10-04 | Multilayer vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5657632A JPS5657632A (en) | 1981-05-20 |
| JPS6342564B2 true JPS6342564B2 (en) | 1988-08-24 |
Family
ID=14978559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12818679A Granted JPS5657632A (en) | 1979-10-04 | 1979-10-04 | Multilayer vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5657632A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4609516A (en) * | 1984-02-17 | 1986-09-02 | Continental Pet Technologies, Inc. | Method of forming laminated preforms |
| JPS60146722U (en) * | 1984-03-09 | 1985-09-28 | ニツポ−株式会社 | Synthetic resin cylindrical body |
| JP2585102B2 (en) * | 1989-07-21 | 1997-02-26 | 松下電工株式会社 | Multicolor molding method in injection molding |
| JPH0526340U (en) * | 1991-09-13 | 1993-04-06 | 東罐興業株式会社 | Synthetic resin container |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5321674A (en) * | 1976-08-10 | 1978-02-28 | Toyo Seikan Kaisha Ltd | Container* and producing method thereof |
-
1979
- 1979-10-04 JP JP12818679A patent/JPS5657632A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5321674A (en) * | 1976-08-10 | 1978-02-28 | Toyo Seikan Kaisha Ltd | Container* and producing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5657632A (en) | 1981-05-20 |
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